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Less power if turned off then turned back on; however, the shock of turning on a cold TV is what wears it out, so the fewer times you do that, the longer it should last, in theory.

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Q: Does a tv use more power if it's left on for an hour or if it's turned off and then back on?
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What does kilowatt hours mean?

kWh = Power(kW) x Time (hours)AnswerA kilowatt hour (symbol kW.h) is a unit of measurement of electrical energy.


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The conversion is not direct, since watts are units of power, while BTU/Hr represents energy per hour of equipment operation. So, in this case, watts will represent the power dissipation of a product. 1 watt = 3.412141633 BTU/Hr It works both ways, of course: 1 BTU/Hr = 0.29307107 watts The above is mathematically correct, but I think how it represents the time value is confusing. I've left it for reference purposes. A Watt is an instantaneous measure of power. It assumes no unit of time. A Watt-Second on the other hand, is 1 Watt of power for 1 Second, which *is* a unit of energy. 1 Watt-Second is equivalent to 1 Joule. A 60 watt lightbulb turned on for exactly 1 second uses 60 Watt-seconds or 60 joules of energy. BTU on the other hand, is a measure of energy and time is implicit in the unit. 1 BTU is equivalent to approx 1055 Joules. 1 Watt-Second = ~0.00095 BTU. A 1000 Watt heater, running for 1 hour(3600 seconds) would consume 1KiloWatt-Hour(KWH) of energy. Or 3,600,000 Joules. 1KiloWatt-Hour = 3412 BTU. OR 1Watt-Hour = 3.412 BTU While you could divide both sides by Hours and get a comparison of power wherein 1W = 3.412 BTU/hr. I think comparing energy in the forms of KWHs and BTUs is more useful than the other way around.


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